Removed error when inputing values for anything that isn't an electron or a photon into a fastsim with predicted weight extrapolation

As described here !67695 (comment 7405876) I introduced an error message for anything that wasn't a photon or an electron when creating inputs for predicted weight extrapolation.

This is a one hot vector, but it should just be left entirely blank for anything else. Removing the error message and leaving the one hot vector blank.